Dairy cows infected with highly pathogenic avian influenza A, or H5N1, in five U.S. states have died or been slaughtered by farmers because they did not recover, according to state officials and academics.
In South Dakota, a dairy farm with 1,700 cows sent a dozen animals to slaughter after they did not recover from the virus and killed another dozen that contracted secondary infections, said Russ Daly, a professor at South Dakota State University and a veterinarian for the state extension office who spoke with the farm.
